/**
 * Moondance UML modeling tool
 * 
 * This program is free software; you can redistribute it and
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package ro.pub.cs.se.moondance.editor;

import org.eclipse.gef.ui.parts.AbstractEditPartViewer;
import org.eclipse.gef.ui.parts.ScrollingGraphicalViewer;
import org.eclipse.swt.events.FocusEvent;

import ro.pub.cs.se.moondance.directedit.ValidationMessageHandler;

/**
 * GraphicalViewer which also knows about ValidationMessageHandler to output
 * error messages to
 */
public class ValidationEnabledGraphicalViewer extends ScrollingGraphicalViewer {

	private ValidationMessageHandler messageHandler;

	/**
	 * ValidationMessageHandler to receive messages
	 * 
	 * @param messageHandler
	 */
	public ValidationEnabledGraphicalViewer(
			ValidationMessageHandler messageHandler) {
		super();
		this.messageHandler = messageHandler;
	}

	/**
	 * @return Returns the messageLabel.
	 */
	public ValidationMessageHandler getValidationHandler() {
		return messageHandler;
	}

	/**
	 * This method is invoked when this viewer's control loses focus. It removes
	 * focus from the {@link AbstractEditPartViewer#focusPart focusPart}, if
	 * there is one.
	 * 
	 * @param fe
	 *            the focusEvent received by this viewer's control
	 */
	protected void handleFocusLost(FocusEvent fe) {
		// give the superclass a chance to handle this first
		super.handleFocusLost(fe);
		// call reset on the MessageHandler itself
		messageHandler.reset();
	}
}